Method and means for using low-compression fuels



V Patented Mar. 2, 1926.

UNITED STATES ParaNT OFFICE.

THOMAS MIDGLEY, JR., OF DAYTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

GENERAL MOTORS CORPORATION, DELAWARE.

OF DETROIT, MICHIGAN, A CORPORATION OF METHOD AND, MEANS FOR USING LOW-COMPRESSION FUELS.

No Drawing.

To all whom it may concern: I

Be it known that I, THOMAS MIocLnY, Jr., a citizen of the United States of America, residing at Dayton, county of Montgomery,

and State "of Ohio, haveinvented certain new and useful Improvements in Methods and Means for Using Low-Compression Fuels, of which the following is a full, clear, and e'xactdescription.

Thisinvention relates to the art of suppressing a fuel knock when a combustible gaseous mixture containing a low compression fuel such, for example, as kerosene and gasoline is burned under arelatively I'Fhigh pressure. The principal object of this invention is to employ tellurium compounds to suppress the uel knock. I V

This application is a continuation in part of my copending application, Serial N 0.

2q 553,270, filed April 15, 1922.

25, now marketed, to about 125 pounds for aviation gasoline employed in airplane en-I These fuels are termed low com Kerosene has a critical compression pressure of'about 55 pounds. The critical com-' pression pressure of gasoline varies from about 75 ,pounds for the commoner forms carrying out my invention, I dissolve 5 d; c. of diethyl telluride Te(C H 1n 1 gallon Jan internal-combustion engine having a of gasoline having a normal critical compression pressure of about 70 pounds. 'lhis solution or high com ression fuel is fed through a carburetor into the cylinder of Application filed Septembcr 18, 1923. Serial No. 663,495.-

compression pressure of about 100 pounds, the solution being vaporized and mixed with air as is common practice in engine operation. The gaseous high compression fuel is ignited and the engine operated without a fuel knock. The gasoline forms the fuel base and the tellurium compound increases the critical compression pressure of this base.

h This process may be varied by changing the proportions according to the increase in critical compression using other tellurium compounds in place of the diethyl telluride. Among the (30mpounds which I have successfully employed are other alkyl compounds including dipropyl and dimethyl telluride, and diphenvl telluride. v i 1 I prefer to employ the tellurium compounds which are soluble in the fuel to pro mote the mixing of the two. Blending agents may be employed if the tellurium compound does not dissolve readily in the fuel. The compound may be added to the fuel-air mixture just before the latter is burned. I

I claim:

1. A. composition of matter comprising a low compression fuel; and a'volatile tellurium compound incorporated therein and adapted to increase the critical compression pressure of the fuel.

2. A composition of matter comprising a low compression fuel, such as kerosene or gasoline; and a volatile alkyl compound of tellurium incorporated homogeneously therein and adapted to increase the critical compression pressure of the fuel.

3. A composition of matter comprising a low compression fuel; and a volatile ethyl compound of tellurium incorporated therein.

p 4. A composition of matter comprising gasoline; and diethyl telluride.

In testimony whereof I hereto affix my signature;

THOMAS MIDGLEY, J R,

pressure desired and by 

